OUTDOOR AIRFLOW CONTROLLERS

Outdoor Airflow Controller Modules for Systems without an Airside Economizer

EMOA-or-MOA-5000-Transmitter-Angle

OUTDOOR AIRFLOW CONTROLLERS

OAC Series

OAC-5000

Outdoor Airflow Controller Modules for Systems without an Airside Economizer

The OAC-5000 has an additional analog input and analog output compared to the OAC-4000. As a result, the OAC-5000 can be used with analog CO2 sensors as well as approved BACnet MS/TP CO2 or occupancy counters. It also provides an airflow output signal, if desired.

Contact closure relay can be assigned to notification alarms or active control mode

MS/TP BACnet connection

Overview

The OAC-5000 can be provided with a single integrated IAT-DI duct probe, one or two integrated IAT-UI or IAT-US universal mount probes or an approved external BACnet MS/TP airflow measurement device.

The OAC-5000 interfaces with analog or approved MS/TP BACnet CO2 sensors and occupancy counters when DCV is required. An analog airflow output signal is also provided.

The OAC-5000 modulates a proportional damper actuator or variable speed fan (VFD or ECM with analog speed control input) to maintain the outdoor airflow rate when an external binary trigger is active (i.e. occupied mode). The binary trigger is typically is provided by a thermostat or other analog or MS/TP BACnet binary output. The trigger can also be provided by the 24 VAC control signal used when a two-position actuator is provided for outdoor air control (replace the two-position actuator with a proportional actuator).

Advanced logic and airflow measurement improves traditional CO2-DCV when demand control ventilation is required. The OAC-5000 controller resets the outdoor airflow setpoint between user defined minimum and maximum airflow limits to maintain either a user defined fixed CO2 level or variable airflow setpoint based on the population using a built-in CO2/airflow counting algorithm or external occupancy counter.

The OAC-5000 interfaces with most MS/TP BACnet building automation systems and supports full read/write privileges as a BACnet 1/8 load master. An RS-485 signal isolator is available when an isolated MS/TP network is required.

Note: If an economizer controller fault signal is required, an actuator feedback signal must be connected to AI2 and an analog input for a CO2 sensor is not available. Use an approved BACnet MS/TP sensor if CO2 measurement is required